今天我做React開發時，遇到如下的錯誤消息：
Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:
- You might have mismatching versions of React and the renderer (such as React DOM)
- You might be breaking the Rules of Hooks
- You might have more than one copy of React in the same app
See https://fb.me/react-invalid-hook-call for tips about how to debug and fix this problem.
這個錯誤輸出已經提醒了我，出錯誤的代碼在我的應用程序MyApp.jsx里：
原來是我這段const變量初始化代碼寫到function外部了：
將其移至內部后錯誤消失：
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